Is it possible to observe scroll offset? This code does not seem to work:

val state = rememberScrollState()
LaunchedEffect(state) {
  snapshotFlow { state.value }.collect {
    Log.v(TAG, "$it") // This is never called?
  }
}
Box(Modifier.fillMaxSize().verticalScroll(state)) {
   // ... Lot of box contents
}

Is it possible to embed Skika "view" inside compose ande vice-versa? (Also interested in web and desktop)

Is there a way to specify a source set to be shared between Android + Desktop targets for compose? I also have a compose web target so i cannot support compose foundation / material inside commonMain sourceset

Does anyone know if it’s even possible to create a Compose rule based test in a library module? I’m not having much luck, and it keeps saying it’s not finding any tests. I would prefer unit tests to androidTest but i don’t that’s really doable either.

I apologize if this has been asked already, but wanted to double check here. what are the effective differences between the two (apart from one being a composable function) ?

// Using derivedStateOf
fun nameA(name: String): State<String> {
    return derivedStateOf { "Hello $name" } 
}

// Using rememberUpdatedState
@Composable
fun nameA(name: String): State<String> {
    return rememberUpdatedState("Hello $name")
}

Hey everyone. i am getting this exception when navigating to a

fragment with ComposeView

Fatal Exception: java.lang.IllegalStateException 
ViewTreeLifecycleOwner not found from androidx.constraintlayout.widget.ConstraintLayout{aace22b V.E...... ......ID 0,0-1080,2358 #7f0a114e app:id/root}

versions used

fragment - 1.3.1 
compose - 1.0.2

Is it possible to render an AbstractComposeView in Android Studio ? Ex: I have a class

MyCustomComposeView : AbstractComposeView

, in the split view, even if a select Custom view, nothing shows up

Guys, I don’t understand how to make a Image with inner padding

Icon(
            painter = painterResource(id = R.drawable.ic_baseline_delete_24),
            modifier = Modifier.align(Alignment.TopEnd)
                .size(40.dp)
                .padding(8.dp)
)

Still there is not inner padding applied somehow…

Is there a way to animate change in a `Button`s

ButtonColors

based on the

enabled

property value? I have a button for which I’ve defined the disabled and enabled colors as shown below. How can I animate the color change when the

enabled

property changes?

colors = ButtonDefaults.buttonColors(
            backgroundColor = colors.primaryVariant,
            disabledBackgroundColor = colors.secondaryVariant
        ),

Is there any elegant way to hide the BottomBar when the keyboard is shown? I'm using the Accompanist Insets library which gives me my desired keyboard behavior, but I want my TextField directly above my keyboard after the user clicked on it.

I need to inform the grand-grand-[grand]-parent of LazyRow that scroll is in progress. What is the most idiomatic way to do this? Code in thread.

Is there some documentation explaining the differences from

Layout

and

SubcomposeLayout

? what changes in performances? Why do we need a

SubcomposeLayout

for

BoxWithConstraints

? A lot of the time all you want is the size (width / height) of the composable, which you can get with

Modifier.onSizeChanged {}

or

Modifier.onGloballyPositioned {}

but it is asynchronous: you need to wait for the first composition before you get a callback to that, which means if you need the size of the widget to do something on the UI you'll have a flickering. Can someone give me an in-depth answer or a link with an in-depth answer to these things? What I'm most interest in is what are the drawback of using subcompositions and what are all the options to get the layout constraints / why we need subcomposition to get them before composing (modifiers have access to them). EDIT: for instance

IntrinsicSize

stop working if a child has

BoxWithConstraints

right? Thanks

HI Team anyone integrated ktlint with compose project ?

Are preview functions removed from release build by Proguard or R8?

Is there something I can use to erase things, like kinda erasing images or text on gesture, do I need Canvas for that?

What is the appropriated way to load a dimension resource as SP? Currently

dimensionResource

returns a DP value and it looks like there is no support to SP at all in the docs: https://developer.android.com/jetpack/compose/resources

Hello folks! Is there a way to get the current progress of

Transition

on a more granular level rather than current/target state? I'm trying to use

Transition.playTimeNanos

and

Transition.totalDurationNanos

. But total duration is calculated only in seek mode, which as I assume is reserved for tooling. cc @Doris Liu

Is there a way to make text wrap in a

BasicTextField

, while still enforcing

singleLine

? I don’t want newline characters, and I don’t want the user to have to horizontal scroll.

I'm trying to determine the best way to manage changes in UI state when the screen configuration changes. I use the width provided within

BoxWithConstraints

to compute the number of a particular UI element that can fit on the screen. Let’s say I want two elements when the width is “portrait” and three when it is “landscape”. These elements display editable state that I want retained across rotations, so that when the third element is rotated off screen and then back on, it displays its old data. (My state is “global”, so I’m not talking about

rememberSaveable

.) The composable I've written that detects the rotation puts out the appropriate number of elements and then uses a

SideEffect

to tell the state what the number of elements is. This seems backwards, since it’s like the state change is reacting to the UI change. (Another detail that may be relevant: I have a button that “tabs through” the visible elements, so that button’s callback needs to check the state to know what’s on screen.) Now I’m thinking that instead I should use a

LaunchedEffect

(with key the number of elements) to update the state and then use the number of elements as recorded in the state (rather than in the local variable as above) to generate the elements. This seems more natural, almost like making configuration change a callback. In any case, I wanted to ask about best practices before I got too far off track. Thanks.

Since the

LazyVerticalGrid

is experimental. Is there any workaround to create grid list using

LazyColumn

?

If I want the text color be different for light and dark mode, should I replace my typography for both modes like it is done for colors, or there is a way to just reference theme's color so it changes automatically? I was thinking that I could do something like this

@Immutable
data class CustomTypography(
    val title_s: TextStyle = TextStyle(fontSize = 32.sp, color = CustomTheme.colors.customPrymaryColor)
)

but it says that

Composable invocations can only happen from the context of composable function

Woot! https://twitter.com/chrisbanes/status/1450394964307976196

Hi Team 👋, How can I add a

stickyHeader

to

LazyVerticalGrid

? Is there any workaround solution for this?

Hi, I am a beginner. Cay you give me a road map how can I learn android development with jetpack compose. I already know kotlin basics.

How to do partial and full swipe on a list of items? I would like to implement this behavior. https://github.com/rambler-digital-solutions/swipe-layout-android

Q: How to share a viewmodel between NavGraph components (only) I would like to share a viewmodel between many composables. Just like how we share a viewmodel between fragments within an Activity. But when I try this

setContent {
    val navController = rememberNavController()

    NavHost(navController = navController, startDestination = "home") {
        navigation(startDestination = "username", route = "login") {
            // FIXME: I get an error here
            val viewModel: LoginViewModel = viewModel()
            composable("username") { ... }
            composable("password") { ... }
            composable("registration") { ... }
        }
    }
}

I get an error

@Composable invocations can only happen from the context of a @Composable function

Need • The viewmodel should only be active in the NavGraph Scope. • When I go to a different route and come back I should initialize a new viewmodel (this is why I'm calling it in the NavGraph) Almost similar solution 1. Answer by [Philip Dukhov](https://stackoverflow.com/users/3585796/philip-dukhov) for the question [How to share a viewmodel between two or more Jetpack composables inside a Compose NavGraph?](https://stackoverflow.com/a/68857871/5698740) a. But in this approach the viewmodel stays in the scope of the activity that launched it and so is never garbage collected.

How can I blur the persons legs? Code in thread

I always run into

NoSuchMethodError

after making tweaks to composables in my design system - cleaning & rebuilding the project fixes it (the design system is in a separate module). Any ideas on what I can do to narrow the issue down before I post a bug-report? 🧵👀

I don't find anything in Compose docs regarding how to request Android permissions? ...